ReadFromPipeAsync() snippet while(!cancellationToken.IsCancellationRequested) try/finally, mark pipe complete via CompleteAsync(), etc. - use IsValidChecksum() if we are receiving - use GetInternetChecksum() if we are sending We can perform either of the checksum methods here _ = await socket.ReceiveAsync(buffer, socketFlags, cancellationToken) Memory buffer = writer.GetMemory(minimumBufferSize) WriteToPipeAsync() snippet while(!cancellationToken.IsCancellationRequested) Task reading = ReadFromPipeAsync(pipe.Reader, cancellationToken) Īwait Task.WhenAll(reading, writing).ConfigureAwait(true) Task writing = WriteToPipeAsync(pipe.Writer, _socket, cancellationToken) ResumeWriterThreshold: 1400) // or MTU - TCP/IP Headers Example UsageĬapturePacketsAsync() snippet PipeOptions options = new( when calculating the checksum, and includeĮDIT: I added some additional context surrounding the Extension Methods section (above) and I also added an example use case (below). Note: We should ignore the Header Checksum value bytes // Version and Internal Header Length / An implementation of the IPv4 header checksum calculation,įor a detailed explanation of the loop above: i = 0 e.g. => CalculateChecksum(bytes, ignoreHeaderChecksum: false) = 0 Public static bool IsValidChecksum(this ReadOnlySpan bytes) => CalculateChecksum(bytes, ignoreHeaderChecksum: true) public static ushort GetInternetChecksum(this ReadOnlySpan bytes) ![]() They differ only by ignoring the 10th byte (Header Checksum). They produce the API to expose the private method (below). Note: These are two extension methods to illustrate the only two use cases that a calculation of the checksum would be need in the context of reading bytes contained within a IPv4 packet. Appreciate any feedback! Extension Methods I made use of the "newer" ReadOnlySpan classes to optimize things a bit. So, I decided to made one as defined in RFC 791. I could not find an implementation of the IPv4 header checksum calculation.
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